Vivaldi antenna mounted on a large PEC platform
 
The large Vivaldi antenna array is mounted on a large PEC box when it is measured in the practical application. To compare the simulation results with the measurement data, the large PEC base should also be included in the computational domain. Without the large PEC base, the error of simulation is 23% from the measurement data. However, if the large PEC base is included in the domain, the error will be reduced to 3%.
Vivaldi Antenna on Box
 
 
 
Far field pattern comparison
with and without PEC base
 
Far field pattern with the PEC base
Far field pattern without
the PEC base